/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassSubsystemAccess.h
void GetSubsystemRequirementBits ( [FMassExternalSubsystemBitSet](API\Plugins\MassEntity\FMassExternalSubsystemBitSet) & OutConstSubsystemsBitSet, [FMassExternalSubsystemBitSet](API\Plugins\MassEntity\FMassExternalSubsystemBitSet) & OutMutableSubsystemsBitSet )